200 On Aquatic Caruivorcus Coleoptera or Dytiscide. 
126, Laccophilus quadrivittatus, Aube., M.C.—Ovalis, minus latus, subdepressus, 
pernitidus, leevigatus, rufo-testaceus, thorace anterius in medio et posterius, elytris- 
que summa basi infuscatis, his fascia lata mediali nigro-fusca. Long. 33, lat. 
vix 2 m.m. 
In this species, the broad yellow apical portion of the elytra is more or less 
infuscated across its middle portion, so as to give the appearance of a subapical 
yellow fascia ; the male has the tarsi but little thickened; in this sex the apical 
ventral segment is rather more truncate than in the female, and appears slightly 
sinuate-truncate on each side. The species is a very smooth and shining one, and 
the oblique strize or scratches on the ventral segments are not conspicuous. 
Antilles, Porto Rico. 556. 
127. Laccophilus gentilis, Lec., M.C.—Ovalis, angustulus, subdepressus, nitidus, 
ruto-testaceus, prothorace anterius in medio et posterius obscuriore, elytris sub- 
tiliter punctulatis, fuscis, vage rufo-signatis. Long. 82, lat. 13 m.m. 
In this species the markings are ill defined; there is on the elytra a more or less 
complete sub-basal pale band, and a spot on the middle of the side, and another 
subapical one, the apex also being pale, The sculpture of the elytra though very 
fine is distinct, and the scratches on the ventral seements are rather conspicuous. 
The male has the front and middle tarsi rather thicker than in the female. There 
is but slight sexual difference in the form of the apical ventral segment. 
A female specimen (from Cuba?) in the collection of the Brussels Museum, is 
rather larger and shows some other slight differences, so that it may prove to be 
another species. 
North America, Louisiana. 557. 
Group 3. 
128. Dytiscus interruptus, Panz. Laccophilus minutus, M.C.—Ovalis, sat latus, 
minus convexus, pernitidus, leevigatus, testaceus, elytris plus minusve infuscatis, cum 
signaturis testaceis plus minusve indistinctis ; prothorace basi in medio brevius 
producto. Long. 43, lat. 25 m.m. 
In the male the front and middle tarsi are only very slightly incrassate ; the 
apical ventral segment is rather more truncate in the male than it is in the female 
and is very slightly sinuate on each side. There is a coxal file, composed of rather 
numerous striz, which are separated by wide but only very slightly elevated spaces. 
This file is about equally as distinct in the female as it is in the male. The species 
varies in colour, and when the infuscation of the elytra is very slght the yellow 
marks are of course less evident. The darker specimens come from Corsica, Sardinia, 
